Does anyone have any ideas about this?
He keeps rapidly swimming towards the glass with his fins open while opening and closing his mouth, it almost looks like he is ramming himself agasint the glass. Then he tires and he clamps his fins for a few seconds. Then he opens his fins up again and starts going at it again.
Ive never seen this behavior before, but he is most def attacking the aquarium wall.

Is there a light on the tank? if so, turn it off. I had that problem too but then I dropped the light INTO the tank . No more light, there is some from a window. He no longer sees his reflection and has stoped trying to fight himself.